<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="UTF-8">
		<meta name="viewport" content="width=device-width, initial-scale=1.0">
		<meta http-equiv="X-UA-Compatible" content="ie=edge">
		<meta http-equiv="X-UA-Compatible" content="ie=edge">
		<title>border渐变</title>
		<style>
			.button1 {
				background: transparent;
				color: #23b7cb;
				font-size: 15px;
				padding: 5px 15px;
				border: 1px transparent solid;
				border-image: linear-gradient(to right, #000718, #23b7cb) 1 10;
			}

			button {
				color: #23b7cb;
				font-size: 15px;
				padding: 5px 15px;
				background: #fff;
				border: 1px transparent solid;
				border-radius: 30px;
				position: relative;
			}

			button:after {
				content: '';
				position: absolute;
				top: -3px;
				bottom: -3px;
				left: -3px;
				right: -3px;
				background: linear-gradient(135deg, #000781, #23b7cb);
				border-radius: 30px;
				content: '';
				z-index: -1;
			}
			
		
		</style>
	</head>
	<body>
		<button>进入平台</button>
		<div class="button1"></div>

	</body>
</html>
